Hello. Two years ago I bough this oscilloscope and I didn't use very often. The problem is that the oscilloscope does whatever it wants. Keyboard is not responding most of the time and when I turn it on, it automatically "presses" some keys. I tryied changing all the ICs on the keyboard and also the 5V regulator on the mainboard because it was very hot. Does anyone know what could cause this issue? I would be very grateful for any help.